All excellent and valid points, I expect no less from you, but I'm afraid me and MikeyB have an incurable condition called acute originality syndrome which I'm reliably informed is beyond hope.
Also as I'm 71 the odds are I'll be dead and well and truly buried before my new set of Aquajets will be perished and out of date.
Off now with my zimmer frame for my nightly cup of Horlicks.
Go on with you Len, I'm only 6 years behind you, but i'm not ready for the pipe and slippers yet! Just because i've got a few years under my belt, doesn't mean I have to slow down, quite the reverse! The older I get, the more I realize I don't have time to waste dawdling around! I think I have the reverse of your syndrome, I can't bear to leave a car stock, even before i've handed over the cash, I'm contemplating what mods will best suit my new purchase! And my version is just as incurable! I fully expect to wear several more sets of tyres out before I head for the great Custom shop in the sky! In a few weeks, entries are going to open for the 2020 RBRR and I fully intend to be on it!
It's your car and i'm perfectly happy for you to keep it the way you like it, all original, right down to the designed in faults and production economies. And if these tyres will make you happy, go get 'em!